Fuse plug



May 20, 1924. 1,495,035

H. T. PAISTE FUSE PLUG Filed Feb. 10. 1920 Patented May 20, 1924.

UNITED STATES 1,495,035 PATENT OFFICE.

HENRY T. PAISTE, F PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO H. T. PAISTE COMPANY, OF PHILADELPHIA, PENNSYLVANIA, A CORPORATION OF PENNSYL- VAN IA.

, FUSE PLUG.

Application filed February 10, 1920. Serial No. 357,536.

To all whom it may concern:

Be it known that I, HENRY T. PAISTE, a citizen of the United States, residing in Philadelphia, Pennsylvania, have invented Fuse Plugs, of which the following is a specification. V

One object of my invention is to provide a fuse plug of the type which includes a renewable fuse-carrying capsule, whose'construction shall be such as to insure good contactbetween the fuse on said capsule and the shell of the plug body even though the capsule shall not be inserted in the latter for its full distance; the invention more, particularly contemplating a novel form of contact shell formed and disposed to frictionally engage the fuse when the capsule on which this is carried has been either partially or wholly inserted in the fuse body.

Another object of my invention is to provide a fuse plug with a novel form of body structure especially designed to insure the escape of the gases or heated air formed upon the blowing of the fuse by an excessive current; the invention also including a novel form of fuse capsule especially designed to cooperate with suitably formed frictional holding members on a fuse body Q to insure said body and capsule remaining in frictional engagement until forcibly separated.

These objects and other advantageous ends I attain as hereinafter set forth, reference being had to the accompanying drawings, in which,

Figs. land 2 are respectively a s de elevation and a bottom plan of a fuse plug constructed in accordance with my invention;

3 is a plan similar to Fig. 2 with the fuse capsule removed;

Fig. 4 is a vertical section on the line 44, Fig. 3;

Figs. 5 and 6 are respectlvely a side elevation and a plan of the fuse capsule;

Fig. 7 is a vertical section on the line 77, Fig. 6; and

Fig. 8 is a plan of the fuse body after the cover and its retaining shell have been removed.

In the above drawings 1 represents the porcelain or equivalent insulating frame of the body portion of my fuse plug, which is preferably of a generally cylindrical form enlarged and having an outwardly extending flange 2 at one end. ThlS frame is hollow, its cavity consisting of a cylindrical portion 3 and a portion at of polygonal section, in the present instance hexagonal. The outer face of the flange 2 is radially toothed or corrugated and has mounted upon it one or more mica or other plates 5 of transparent insulating material forming a cover which is held'in place by a flanged sheet metal ring 6. The flange 7 of this ring extends over and is slightly spaced away from the sides of the body flange 2 and is spun or turned inwardly at its extremity so that it is permanently retained in place.

An annular recess 8 is formed in the frame structure 1 adjacent the flange 2 for the reception of the inwardly spun edge of one end of a threadedshell 9, forming one of the main contacts of the fuse plug. The second end of this shell is extended inwardly over the smaller end of the frame structure 1 and terminates in a series of spring tongues 10 which are projected or bent into the hexagonal portion 4 of the cavity of the frame structure. These tongues are preferably of pointed or triangular form and extend away from the walls of the cavity at an acute angle so as to be more or less yielding and frictionally engage the flat sides of the hexagonal portion 11 of a fuse capsule 12 formed of porcelain or other insulating material and also including a cylindrical portion 13 formed to more or less closely fit into the cylindrical part3 of the cavity in the body. Y

Said capsule also has at one end an out wardly extending flange 14; of substantially the diameter of the small end of the body and has a substantially cylindrical passage or cavity closed at its'flanged end 14: by a metallic contact member 15. This latter has portions extending into the cavity of the capsule where it is connected to one end of the fuse 16. This latter extends through the hollow interior of the capsule and is bent outwardly through a notch 17 in the open or unflanged end thereof, from whence it passes longitudinally over the outside surface of the parts 11 and 13 to the flange 14 where it is bent outwardly at right angles.

This fuse, which is preferably of thin strip material such as zinc, terminates adj aeent the outer edge of the flange 14: so that when the capsule is inserted in the hollow 3-4 of the fuse plug body, the outer surfaces of its parts 13 and 11 are frictionally engaged by the tongues 10 which ultimately rest against the flat portions of the hexagonal part 11 and effectually retain thecapsule in place, Moreover, regardless of how far said; capsule is inserted, the outer portion of the fuse 16is certain to be frictionally engaged by and make good electrical contact with one of the spring tongues 10, so that even if said plug should not be forced to its full extent into the body, a circuit is none the'less certainly established from the contact 15 through the fuse 16 to one of the tongues 10 and thence to the threaded shell 9. 1;

It is noted that in addition to the corrugationsor teeth formed in theouter faceof the flange 2 at one end ofthe body 1, a second set of substantiallyradial corrugations 18 is formed in the oppositev or overhung part of said flange and since the flange 7 of the ring 6 loosely fits overthisflange, any gases or hot air formed within the cavity of the fuse plug uponblowing of the fuse, are

'freeto escape through the channels thus provided; While as described, the capsule 'is firmly heldinthe'fuseplug body, it may fbewithdrawn when desired to permit of the inspection of its fuse or if the latter'be broken ordefective, it may be replaced by a new capsule.

'I claim; a

1. The combination of a hollow fuse plug body including a threadedshellopen at one end; a plurality of spring tongues connected to the shell and extending into thehollow of the'body from the open end thereof; and a capsuleremovably mounted in said hollow ofthe body having a fuse positioned to electrically tongues.

engage any one of the spring 2. The combination of a hollow fuse plug bodyhaving'polygonal cavity; a threaded shell on the body; a plurality of spring :of the spring tongues.

,3. The combination of a fuse plug body including an insulating supporting strucvtnrehaving a longitudinally extending cavity; a threaded shell mounted onthe body 7 one end formed with substantially radial teeth on its opposite faces; a cover for the flanged end of the body; a ring flanged at both edges to project over thetwo sets of teeth of the body and retain the cover in position; with a threaded shell mounted on said body.

5. The combination in a fuse :plug of a .body of insulating material having .a cavity formed with cylindrical and polygonal portions; with a threaded shell mounted on the body having a series of spring tongues ex- .tending into the polygonal portion of the cavity thereof. 1

6. A fuse capsule consisting of a body of insulating material havingja cylindrical portion, a flange anda polygonal portion intermediate said first'two parts; and, a-fuse in the capsule having a part. extending over thesurface of the polygonal'portionthereof.

7.- The combination-in a fuse plug of a: body of insulating material having a longi- ,tudina-lly extending cavityv formed with cylindrical and polygonal, portions; a threaded 'shellon saidbody having spring tongues extending into the polygonal-portion fofjthe cavity thereof; with a capsule consisting of an. insulating body formed with cylindrical and polygonal portions shaped to fit the corresponding parts of the body; andafuse on said capsulehaving a portion extending tongues connected to said shell extending over one sideof its polygonal portion-in position to cooperate with and electricallyen HENRY T. PAlSTE.

gage one of the spring tongues ofjthe body. 

